An Unusual Hydrolysis of α,β-Dichloroethyl Isocyanates with the Formation of 1,3-Oxazetidinones

A Rapid and Efficient Access to Diaryldibenzo[b,f][1,5]diazocines

“…A reaction between phthaldehyde and phenyl isocyanate was also reported, which was postulated to go through a 1,3-oxazetidin-2-one intermediate to give N -phenyl-phthalimidine . 1,3-Oxazetidin-2-one was also prepared by other pathways, and its release of CO 2 to form an imine bond at an elevated temperature was confirmed …”

“…13 1,3-Oxazetidin-2-one was also prepared by other pathways, and its release of CO 2 to form an imine bond at an elevated temperature was confirmed. 14 In summary, a rapid and efficient method for the synthesis of diaryldibenzo[b,f][1,5]diazocines was developed. Starting from easily available 2-benzoylbenzoic acid, symmetric diazocines could be prepared in two steps in good yield.…”